Saw this article yesterday, and while unfortunately, I have to say like so many other things, comparing Europe and the US is apples and oranges. Sweden had little to no gang activity prior to their flood of immigrants, the US has had various gang/organized crime problems for decades which are not related to immigration, legal or illegal.
Not saying shipping undesirables back to their country of origin, either by catching the illegals or revoking green cards for participants in criminal activities is a bad thing, but it would only help a portion of our gang problem. And good on Sweden for recognizing and acting on the issue instead of ignoring the obvious out of fear of being called racist.